Help me In this problem

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Using elimination, what is -4x+2y=-12 4x+8y=-24

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?